[martin8412]

Okay - So reading through that I get two impressions. They can't release source code because they use proprietary hardware. Secondly they believe that security through obscurity is better than publishing the code for everyone to see.

[kelnos]

I doubt they keep it closed as a (dubious) security measure. Likely they believe the source gives them some sort of competitive advantage. (Not saying they're right or wrong about that, just that's likely what they believe.)